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Whenyouinstallmemorymoduleswithdifferentfrequenciesintothememoryslotsforthesame
microprocessor,allthememorymodulesrunatthelowestfrequency.
Itisrecommendedthatyouinstallthehigh-frequencymemorymodulesintothememoryslotsforthe
samemicroprocessortoensurehighperformance.
Figure41.CPU1DIMMs
Table4.Memorymoduleinstallationrulesforserverswithonemicroprocessor
CPU1DIMM
A1A2B1B2
C1C2
OneDIMM
X
TwoDIMMsXX
ThreeDIMMsXXX
FourDIMMsXXXX
SixDIMMs
XXXXXX
Thefollowingtableexplainsthememorymoduleinstallationrulesforserversthathavetwomicroprocessors
(CPU1andCPU2)installed.The“X”markindicatesthememoryslotsintowhichthememorymodules
shouldbeinstalledindifferentsituations.
Notes:
Whenyouinstallmemorymoduleswithdifferentranksinonechannel,startfromthefarthestmemoryslot
inthechannelandinstallthememorymodulethathasthemostranksfirst.
Whenyouinstall1.35Vmemorymodulesand1.50Vmemorymodulesintothememoryslotsforthe
samemicroprocessor,allthememorymodulesrunat1.50V.
Whenyouinstallmemorymoduleswithdifferentfrequenciesintothememoryslotsforthesame
microprocessor,allthememorymodulesrunatthelowestfrequency.
Itisrecommendedthatyouinstallthehigh-frequencymemorymodulesintothememoryslotsforthe
samemicroprocessortoensurehighperformance.
Chapter6.Installing,removing,orreplacinghardware83
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